SafeFunction.getUsingDefault()

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- SafeFunction.getUsingDefault()
+
 ## [8.6.4] - 2024-07-18
 
 ### Fixed

fj-core/src/main/java/org/fugerit/java/core/function/SafeFunction.java

@@ -196,6 +196,25 @@ public static <T> T getWithDefault( UnsafeSupplier<T, Exception> supplier, Funct
 		}
 		return res;
 	}
+
+	/**
+	 * <p>Return the value provided by the supplier, if null will use the alternative supplier.</p>
+	 *
+	 * @param <T>			the return type
+	 * @param supplier		the {@link UnsafeSupplier} the return value supplier
+	 * @param altSupplier	the alternative {@link UnsafeSupplier} the return value supplier
+	 * @return				the value evaluated by the supplier
+	 */
+	public static <T> T getUsingDefault( UnsafeSupplier<T, Exception> supplier, UnsafeSupplier<T, Exception> altSupplier ) {
+		return SafeFunction.get( () -> {
+			T res = supplier.get();
+			if ( res != null ) {
+				return res;
+			} else {
+				return altSupplier.get();
+			}
+		} );
+	}
 
 	/**
 	 * <p>Apply an UnsafeVoid function, using a consumer the handle any Exception raised.</p>

fj-core/src/test/java/test/org/fugerit/java/core/function/TestSafeFunction.java

@@ -25,6 +25,12 @@ public class TestSafeFunction {
 	private static final DAOException TEST_CHECKED_EX = new DAOException( "test checked" );
 
 	private static final DAORuntimeException TEST_RUNTIME_EX = new DAORuntimeException( "test runtime" );
+
+	@Test
+	public void testGetUsingDefault() {
+		Assert.assertEquals( "2", SafeFunction.getUsingDefault( () -> null, () -> "2" ) );
+		Assert.assertEquals( "0", SafeFunction.getUsingDefault( () -> "0", () -> "1" ) );
+	}
 
 	@Test
 	public void testFailGet() {